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As mentioned above, Rotella 15w40 is very good dino oil. If you want to add zinc to protect your cam and lifters, check out Redline Engine Break-In Additive. You can use part of a bottle with each oil change.
There's no reason to EVER add anything to oil !
If you feel the need to do so than you need the correct oil.
I run Rotella T5 10-30 in all my 4.0's mostly.....more than enough ZDDP for our flat tappet style engines, I have no need for 15-40 as I don't live in 100 degree climates or have oil PSI issues. During the winter months I use a mixture of T5 and Pennzoil HM 5-30 in my WJ.
Racing oil is for just that........and it lacks the proper add pack for your application.